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you could go with things such as carbon fiber overlays and new shiftknobs. swap out your interior bulbs to add some distinct lighting? thats all id do personally, minus the shiftknob
One cheap but cool mod is Lexus seatbelt pads. Not bad if you drive long distance and have some discomfort from the belt being tight. They look nice as well. Some members have had nice pillows made for the backseat with the Lexus logo embroidered. These are a few thoughts.
I just got all weather Lexus floor mats for an interior add-on. At first I wasn't too thrilled with rubber mats...but once I placed them in my front and back seat, I think they look really nice! Working in an engineering/construction field, I found they protect well against dirt and rocks.